:root{
  --red:#E23A2E;
  --red-deep:#A3201A;
  --ink:#17161A;
  --graphite:#3A3A42;
  --warm:#F7F3EC;
  --paper:#FFFDF8;
  --cyan:#12B5A6;
  --amber:#F5A623;
  --silver:#C9CCD3;
  --deep-teal:#0B6F68;
  --font-head:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--warm);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.95;
}
img,svg,video{display:block;max-width:100%}
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.08;
  letter-spacing:-.015em;
}
p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--red);outline-offset:2px}
.site-footer :focus-visible{outline-color:var(--amber)}

/* ---------- shell & grid ---------- */
.shell{width:min(1280px,100% - 40px);margin-inline:auto}
@media (min-width:1440px){.shell{width:min(1360px,100% - 96px)}}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.stack{display:grid;gap:clamp(28px,4vw,56px)}
.stack-tight{display:grid;gap:16px}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:200;
  background:var(--ink);color:var(--paper);
  padding:12px 18px;font-size:14px;font-weight:800;letter-spacing:.04em;
  transition:top .18s ease;
}
.skip-link:focus{top:12px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--paper);
  border-bottom:1px solid var(--silver);
}
.header-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:transparent}
.header-progress-bar{display:block;height:100%;width:0;background:var(--red);transition:width .12s linear}
.header-shell{
  position:relative;
  display:flex;align-items:center;gap:24px;
  min-height:84px;padding-block:12px;
  transition:min-height .22s ease;
}
.header-brand{display:flex;align-items:center;gap:16px;flex:0 1 auto;min-width:0}
.brand-mark{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-dot{width:14px;height:14px;background:var(--red);display:block}
.brand-text{font-family:var(--font-head);font-size:22px;font-weight:900;letter-spacing:-.01em;line-height:1}
.header-meta{
  display:flex;flex-direction:column;gap:6px;justify-content:center;
  border-left:1px solid var(--silver);padding-left:16px;min-width:0;
}
.brand-tagline{font-size:12px;line-height:1.5;color:var(--graphite);letter-spacing:.02em;white-space:nowrap}
.season-badge{
  display:inline-flex;align-items:center;gap:6px;
  align-self:flex-start;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--deep-teal);background:rgba(18,181,166,.1);
  border:1px solid rgba(18,181,166,.4);
  padding:2px 8px;white-space:nowrap;
}
.season-key{background:var(--cyan);color:#052B28;padding:0 4px;font-size:10px;letter-spacing:.1em}
.site-header[data-condensed] .header-shell{min-height:64px}
.site-header[data-condensed] .header-meta{display:none}

.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:10px 14px;border:1px solid var(--ink);background:var(--paper);
  font-size:13px;font-weight:800;letter-spacing:.08em;
}
.nav-toggle-icon{position:relative;display:block;width:18px;height:10px}
.nav-toggle-icon::before,.nav-toggle-icon::after{
  content:"";position:absolute;left:0;right:0;height:2px;background:var(--ink);
  transition:transform .2s ease,top .2s ease;
}
.nav-toggle-icon::before{top:0}
.nav-toggle-icon::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after{top:4px;transform:rotate(-45deg)}

.site-nav{margin-left:auto;display:flex;align-items:center;gap:28px}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-block;padding:8px 12px;
  font-family:var(--font-head);font-size:15px;font-weight:800;letter-spacing:.01em;
  border-bottom:2px solid transparent;
  transition:color .16s ease,border-color .16s ease,background-color .16s ease;
}
.nav-link:hover{color:var(--red);border-bottom-color:var(--red)}
.nav-link[aria-current="page"]{color:var(--red);border-bottom-color:var(--red)}
.nav-actions{display:flex;align-items:center;gap:10px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;border:1px solid var(--ink);
  font-family:var(--font-head);font-size:14px;font-weight:800;letter-spacing:.03em;
  background:transparent;color:var(--ink);cursor:pointer;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.btn-primary{background:var(--red);border-color:var(--red);color:var(--paper)}
.btn-primary:hover{background:var(--red-deep);border-color:var(--red-deep)}
.btn-ghost{background:var(--paper);border-color:var(--silver);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.btn-line{border-color:var(--cyan);color:var(--deep-teal);background:transparent}
.btn-line:hover{background:var(--cyan);border-color:var(--cyan);color:#052B28}

/* ---------- breadcrumb ---------- */
.breadcrumb{margin-block:20px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12px;color:var(--graphite)}
.breadcrumb-list li+li::before{content:"/";margin-right:10px;color:var(--silver)}
.breadcrumb-link{color:var(--deep-teal);border-bottom:1px solid rgba(11,111,104,.35)}
.breadcrumb-link:hover{color:var(--red);border-bottom-color:var(--red)}

/* ---------- section head ---------- */
.section-head{
  display:grid;grid-template-columns:minmax(0,8fr) minmax(0,4fr);
  gap:24px;align-items:end;
  padding-bottom:20px;border-bottom:1px solid var(--ink);
}
.section-kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--red)}
.section-title{font-size:clamp(32px,5vw,56px);margin-top:10px}
.section-note{font-size:14px;line-height:1.9;color:var(--graphite);max-width:34em}

/* ---------- cover ---------- */
.cover{
  position:relative;
  padding-block:clamp(48px,9vw,112px) clamp(32px,5vw,64px);
  border-bottom:1px solid var(--silver);
  background:var(--warm);
}
.cover-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:22px}
.cover-title{font-size:clamp(48px,12vw,168px);line-height:.96;letter-spacing:-.03em}
.cover-lead{margin-top:24px;font-size:clamp(16px,2vw,20px);line-height:1.9;color:var(--graphite);max-width:30em}
.cover-index{display:flex;flex-wrap:wrap;margin-top:clamp(30px,6vw,64px);border-top:1px solid var(--ink)}
.cover-index-item{
  display:flex;align-items:baseline;gap:10px;
  padding:12px 20px 12px 0;margin-right:20px;
  font-family:var(--font-mono);font-size:13px;color:var(--graphite);
  border-right:1px solid var(--silver);
}
.cover-index-item:last-child{border-right:0}
.cover-no{color:var(--red);font-weight:700}

/* ---------- panel ---------- */
.panel{
  position:relative;
  background:var(--paper);
  border:1px solid var(--silver);
  padding:clamp(20px,3vw,36px);
}
.panel-head{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:12px;
  padding-bottom:14px;border-bottom:1px solid var(--silver);margin-bottom:20px;
}
.panel-index{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--red)}
.panel-title{font-size:clamp(20px,2.4vw,28px)}
.panel-body{font-size:16px;line-height:1.95;color:var(--graphite);max-width:38em}
.panel-split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(20px,3vw,32px)}
.panel[data-tone="dark"]{background:var(--ink);border-color:var(--ink);color:var(--warm)}
.panel[data-tone="dark"] .panel-head{border-bottom-color:#33323A}
.panel[data-tone="dark"] .panel-index{color:var(--amber)}
.panel[data-tone="dark"] .panel-body{color:#B9B6BF}

/* ---------- ledger ---------- */
.ledger{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));
  gap:1px;background:var(--silver);border:1px solid var(--silver);
}
.ledger-item{background:var(--paper);padding:16px 18px}
.ledger-key{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--graphite)}
.ledger-value{margin-top:6px;font-family:var(--font-mono);font-size:20px;font-weight:700;letter-spacing:-.01em}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  padding:3px 8px;border:1px solid var(--silver);background:var(--paper);color:var(--graphite);
  white-space:nowrap;
}
.tag-red{background:rgba(226,58,46,.08);border-color:var(--red);color:var(--red-deep)}
.tag-cyan{background:rgba(18,181,166,.1);border-color:var(--cyan);color:var(--deep-teal)}
.tag-amber{background:rgba(245,166,35,.16);border-color:var(--amber);color:#8A5A00}
.tag-line{background:transparent;border-color:var(--ink);color:var(--ink)}

/* ---------- rule block ---------- */
.rule-block{
  display:grid;grid-template-columns:64px minmax(0,1fr);gap:20px;
  padding:18px 0;border-top:1px solid var(--silver);
}
.rule-block:last-child{border-bottom:1px solid var(--silver)}
.rule-no{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--red)}
.rule-body{font-size:15px;line-height:1.95;color:var(--graphite);max-width:38em}

/* ---------- filter ---------- */
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.filter-chip{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  padding:8px 14px;border:1px solid var(--silver);background:var(--paper);color:var(--graphite);
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.filter-chip:hover{border-color:var(--ink);color:var(--ink)}
.filter-chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#052B28;font-weight:700}
.filter-count{margin-left:auto;font-family:var(--font-mono);font-size:12px;color:var(--graphite)}

/* ---------- toc ---------- */
.toc{display:grid;border-left:1px solid var(--silver)}
.toc-link{
  display:block;padding:9px 0 9px 16px;margin-left:-1px;
  font-size:14px;color:var(--graphite);
  border-left:2px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.toc-link:hover{color:var(--ink)}
.toc-link[aria-current="true"]{color:var(--red);border-left-color:var(--red);font-weight:700}

/* ---------- band ---------- */
.band{background:var(--paper);border-top:1px solid var(--silver);border-bottom:1px solid var(--silver);overflow:hidden}
.band-track{
  display:flex;overflow-x:auto;
  scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;
}
.band-track::-webkit-scrollbar{height:6px}
.band-track::-webkit-scrollbar-thumb{background:var(--silver)}
.band-item{
  flex:0 0 min(320px,80vw);scroll-snap-align:start;
  padding:24px;background:var(--paper);border-right:1px solid var(--silver);
}
.band-item:last-child{border-right:0}

/* ---------- image ---------- */
.image-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--silver);background:var(--ink);
}
.image-frame img{width:100%;height:100%;object-fit:cover}
.image-frame[data-ratio="21x9"]{aspect-ratio:21/9}
.image-frame[data-ratio="16x9"]{aspect-ratio:16/9}
.image-frame[data-ratio="3x2"]{aspect-ratio:3/2}
.image-frame[data-ratio="4x5"]{aspect-ratio:4/5}
.image-frame[data-ratio="1x1"]{aspect-ratio:1/1}
.image-ph{
  display:grid;place-items:center;width:100%;height:100%;min-height:160px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--silver);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(201,204,211,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(201,204,211,.16) 1px,transparent 1px);
  background-size:32px 32px;
}
.figure-cap{margin-top:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--graphite)}

/* ---------- table ---------- */
.spec-table{background:var(--paper);font-size:14px}
.spec-table caption{
  caption-side:top;text-align:left;padding-bottom:8px;
  font-family:var(--font-mono);font-size:12px;color:var(--graphite);
}
.spec-table th,.spec-table td{
  text-align:left;padding:12px 14px;border:1px solid var(--silver);vertical-align:top;
}
.spec-table th{
  background:var(--warm);font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;font-weight:700;
}
.spec-table td.num{font-family:var(--font-mono);letter-spacing:.02em}

/* ---------- text utils ---------- */
.mono{font-family:var(--font-mono);letter-spacing:.02em}
.text-measure{max-width:38em}
.kicker{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--red)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(14px)}
.reveal.is-visible{opacity:1;transform:none;transition:opacity .5s ease,transform .5s ease}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:#EDE9E2}
.footer-shell{padding-block:clamp(48px,6vw,72px) 28px}
.footer-top{
  display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:clamp(28px,4vw,56px);
  padding-bottom:36px;border-bottom:1px solid #33323A;
}
.footer-brand-line{font-family:var(--font-head);font-size:clamp(20px,2.6vw,26px);font-weight:900;line-height:1.2;color:var(--paper);letter-spacing:-.01em}
.footer-brand-note{margin-top:14px;font-size:14px;line-height:1.9;color:#A9A6AF;max-width:28em}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.footer-tags .tag{background:transparent}
.footer-tags .tag-cyan{background:rgba(18,181,166,.14);color:#7FE3D9}
.footer-tags .tag-line{border-color:#4A4952;color:#C9CCD3}
.footer-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,32px)}
.footer-col-title{
  padding-bottom:10px;margin-bottom:14px;border-bottom:1px solid #33323A;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--silver);
}
.footer-links{display:grid;gap:10px}
.footer-link{
  font-size:15px;color:#EDE9E2;
  transition:color .16s ease,padding-left .16s ease;
}
.footer-link:hover{color:var(--amber);padding-left:6px}
.footer-contact{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:1px;background:#33323A;border:1px solid #33323A;margin-top:32px;
}
.contact-card{background:var(--ink);padding:20px 22px}
.contact-key{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--cyan)}
.contact-value{margin-top:8px;font-family:var(--font-head);font-size:15px;font-weight:700;line-height:1.6;color:var(--paper);word-break:break-word}
.contact-value.is-mono{font-family:var(--font-mono);letter-spacing:.02em}
.contact-value.is-note{font-family:var(--font-body);font-weight:400;font-size:14px;color:#C4C1CA}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:12px 28px;
  margin-top:28px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:#8D8A94;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:6px 18px}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .header-meta{display:none}
}
@media (max-width:980px){
  .header-shell{min-height:68px;padding-block:10px;gap:12px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;margin:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--paper);
    border-top:1px solid var(--silver);border-bottom:2px solid var(--ink);
    padding:0 20px 20px;
    opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-10px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding-block:8px;border-bottom:1px solid var(--silver)}
  .nav-link{display:block;padding:14px 4px;font-size:17px;border-bottom:1px solid var(--silver)}
  .nav-link:hover{border-bottom-color:var(--silver)}
  .nav-link[aria-current="page"]{border-bottom-color:var(--red)}
  .nav-actions{flex-direction:column;align-items:stretch;gap:10px;padding-top:16px}
  .nav-actions .btn{width:100%}
}
@media (max-width:860px){
  .grid-12{grid-template-columns:minmax(0,1fr);gap:16px}
  .section-head{grid-template-columns:minmax(0,1fr);align-items:start}
  .panel-split{grid-template-columns:minmax(0,1fr)}
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr))}
  .filter-count{margin-left:0;width:100%}
}
@media (max-width:760px){
  .cover-index{flex-wrap:nowrap;overflow-x:auto;scroll-snap-type:x mandatory}
  .cover-index-item{flex:0 0 auto;scroll-snap-align:start}
  .rule-block{grid-template-columns:minmax(0,1fr);gap:6px}
  .footer-columns{grid-template-columns:minmax(0,1fr)}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .reveal{opacity:1;transform:none}
  .header-progress-bar{transition:none}
}